Integration tests: act warnings can still be triggered when testing the editor in multiple tests

[fluiddot]

Description

In #38052 we identified that some act warnings were triggered after the test finishes, we managed to address them by assuring that all timers are run after the editor is initialized. However, I identified that these warnings can still be triggered if you have at least two tests that initialize the editor (check the below example).

Warning:

    Warning: An update to EditorProvider inside a test was not wrapped in act(...).

    When testing, code that causes React state updates should be wrapped into act(...):

    act(() => {
      /* fire events that update state */
    });
    /* assert on the output */

    This ensures that you're testing the behavior the user would see in the browser. Learn more at https://reactjs.org/link/wrap-tests-with-act
        at EditorProvider (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/editor/src/components/provider/index.js:23:2)
        at /Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/editor/src/components/provider/with-registry-provider.js:22:5
        at WithRegistryProvider(EditorProvider)
        at NativeEditorProvider (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/editor/src/components/provider/index.native.js:70:16)
        at WithDispatch(NativeEditorProvider) (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/data/src/components/with-dispatch/index.js:95:26)
        at /Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/data/src/components/with-select/index.js:56:24
        at WithSelect(WithDispatch(NativeEditorProvider)) (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/compose/src/higher-order/pure/index.tsx:36:3)
        at SlotFillProvider (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/components/src/slot-fill/provider.js:18:16)
        at Editor (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/edit-post/src/editor.native.js:30:23)
        at WithDispatch(Editor) (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/data/src/components/with-dispatch/index.js:95:26)
        at /Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/data/src/components/with-select/index.js:56:24
        at WithSelect(WithDispatch(Editor)) (/Users/fluiddot/workspace/gutenberg-mobile/gutenberg/packages/compose/src/higher-order/pure/index.tsx:36:3)

Step-by-step reproduction instructions

1. Create the following test file act-warnings.test.js and place it in packages/react-native-editor/src/test/act-warnings.test.js and include the code below:

/**
 * External dependencies
 */
import { initializeEditor } from 'test/helpers';

/**
 * WordPress dependencies
 */
import { getBlockTypes, unregisterBlockType } from '@wordpress/blocks';
import { registerCoreBlocks } from '@wordpress/block-library';

beforeAll( () => {
	// Register all core blocks
	registerCoreBlocks();
} );

afterAll( () => {
	// Clean up registered blocks
	getBlockTypes().forEach( ( block ) => {
		unregisterBlockType( block.name );
	} );
} );

describe( 'Test act warnings', () => {
	it( 'test #1', () => {
		const { getByTestId } = initializeEditor();

		const blockList = getByTestId( 'block-list-wrapper' );
		expect( blockList ).toBeVisible();
	} );

	it( 'test #2', () => {
		const { getByTestId } = initializeEditor();

		const blockList = getByTestId( 'block-list-wrapper' );
		expect( blockList ).toBeVisible();
	} );
} );

2. Run the following command npm run native test -- act-warnings.test.js
3. Observe that the tests display the act warnings.

Expected behaviour

act warnings shouldn't be displayed when r tests.

Actual behaviour

act warnings are displayed when running tests.

Screenshots or screen recording (optional)

N/A

WordPress information

• WordPress version: N/A
• Gutenberg version: N/A
• Are all plugins except Gutenberg deactivated? N/A
• Are you using a default theme (e.g. Twenty Twenty-One)? N/A

Device information

• Device: N/A
• Operating system: N/A
• WordPress app version: N/A